Django:试图在我的注册表中创建自定义2密码确认。表单无效？

from django import forms

class RegistrationForm(forms.Form):
    password = forms.CharField(widget=forms.PasswordInput)
    confirm_password = forms.CharField(widget=forms.PasswordInput)

class RegistrationForm(forms.Form):
    # ...

    def clean(self):
        cleaned_data = super().clean()
        password = cleaned_data.get("password")
        confirm_password = cleaned_data.get("confirm_password")

        if password and confirm_password and password != confirm_password:
            raise forms.ValidationError("Passwords do not match.")

        return cleaned_data

from django.shortcuts import render, redirect
from .forms import RegistrationForm

def register(request):
    if request.method == "POST":
        form = RegistrationForm(request.POST)
        if form.is_valid():
            # 处理注册逻辑
            return redirect("success")
    else:
        form = RegistrationForm()

    return render(request, "register.html", {"form": form})